Failed to create ImageTargetObserver | Vuforia Developer Portal

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I am learing Vuforia on Unity.

My Unity version is 2020.3.30f1c1 

My Vuforia version is 10.5.5

Each time I click on “play”, the scene turned black and there was an error like this:

Exception in callback: Failed to create ImageTargetObserver: DATABASE_LOAD_ERROR.

UnityEngine.Debug:LogErrorFormat (string,object[])

Vuforia.Utility.ExtensionMethods.DelegateHelper:InvokeDelegate (System.Delegate,object[])

Vuforia.Utility.ExtensionMethods.DelegateHelper:InvokeWithExceptionHandling<Vuforia.VuforiaInitError> (System.Action`1<Vuforia.VuforiaInitError>,Vuforia.VuforiaInitError)

Vuforia.Internal.Core.Engine:InitOnCameraReady ()

Vuforia.WebCam:HandleFirstWebCamFrame ()

Vuforia.WebCam:<Init>b__33_0 (bool)

Vuforia.Internal.Utility.VuforiaCoroutineUtility/<RunCoroutineWithTimeout>d__1:MoveNext ()

UnityEngine.SetupCoroutine:InvokeMoveNext (System.Collections.IEnumerator,intptr)

 

Can anyone help me to fix this error?

Thanks a lot!

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